This question appears to be off-topic. The users who voted to close gave this specific reason:

"Application/website recommendations are off-topic and out of scope. It is better instead to use a particular web app or website and ask for help in any issues you have with it specifically." – Jacob Jan Tuinstra, Alex, jonsca

Jack may look like an ordinary guy,
but he sure gets around, with the help
of us of course -- a small team
dedicated to high quality Immersive
Street-Side Imagery, and bringing mass
coverage online.

Mapjack.com showcases
a new level of mapping technology.
What others have done with NASA
budgets and Star Wars-like equipment,
we've done on a shoestring budget,
along with a few trips to Radio Shack.
Specifically, we developed an array of
proprietary electronics, hardware and
software tools that enable us to
capture an entire city’s streets with
relative ease and excellent image
quality. We have a complete low-cost
scalable system encompassing the
entire work-flow process needed for
Immersive Street-Side Imagery, from
picture gathering to post-processing
to assembling on a Website.

Google have spent a lot of time and money on Streetview already. In the UK they've reached 96% coverage (source). And that's just one country. Wikipedia has a more global perspective.

The problem everyone else has is that they'd be playing catch-up, so unless they've got the resources like Microsoft or perhaps Apple, they couldn't afford it. Even if someone else started the first choice is still going to be Google.

It's one of those cases where being first effectively gives you a monopoly. The other providers need to find a different unique selling point (USP). In Bing's case it looks like it's aerial imagery from planes. The other alternative is to go for countries/cities where Google doesn't offer Streetview at the moment. The problem here is - will these locations generate enough traffic to pay for the service?